TW201510127A - Water-based coating, heat dissipation member, metal component, electronic device - Google Patents

Abstract

The invention provides a water-based coating which is easy to handle, and the water-based coating can form a film having excellent heat dissipation, heat resistance and adhesion. The water-based coating of the present invention includes polyurethane resin particles; a first filler formed by orthorhombic silicate minerals which emit far infrared rays, and water for dispersing the first filler and the polyurethane resin particles.

Description

Water-based paint, heat-dissipating parts, metal parts, electronic devices

This invention relates to an aqueous coating. In particular, it relates to an aqueous coating which can form a film having heat dissipation properties.

A heat sink is known as a member for mounting a heat-generating mechanical or electrical component for the purpose of lowering the temperature by heat dissipation. In the heat sink, in many cases, a metal such as aluminum or copper which is easy to transfer heat is mainly used as a material.

As a method of further improving the heat radiation effect in a heat sink made of aluminum, a method of performing anodizing treatment on the surface to perform alumite processing is known. However, alumite processing requires a degreasing treatment, a water washing, and an anodizing treatment with changing the bath in each of the various steps. Further, since a plurality of fine pores are formed on the film obtained by the anodizing treatment, and the fine pores cause cracking or corrosion, it is further required that the sealing treatment is a post-process. As described above, the alumite processing has a problem that a large number of steps are required to cause poor productivity.

In order to reduce the temperature by heat dissipation, Patent Document 1 discloses, as a liquid phase, an aqueous composition containing a alkali metal ruthenate, water, a specific metal compound, and a coating film composition.

However, in the member for heat dissipation, in addition to high heat dissipation and high productivity, in order to improve heat transfer properties, adhesion to heat sources or heat resistance is also required.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-002813

Therefore, an object of the present invention is to provide an aqueous coating material which is easy to handle and which can form a film excellent in heat dissipation, heat resistance and adhesion.

The inventors of the present invention have conducted intensive studies in order to solve the above problems. As a result, it has been found that an aqueous dispersion containing a polyurethane resin fine particle and an orthorhombic silicate mineral can be an aqueous coating capable of forming a film having high heat dissipation properties, thereby completing the present invention. invention.

An aqueous coating material according to a first aspect of the present invention, comprising: a polyurethane resin fine particle; a first filler formed of an orthorhombic silicate mineral emitting a far infrared ray; and dispersing the polyamic acid The ester resin microparticles are water with the first filler.

The so-called "citrate mineral" may be any natural or artificial, including an aluminosilicate mineral or a citrate compound other than a mineral.

According to the configuration described above, since it is an aqueous coating material, handling or transportation such as coating becomes easy. In addition, because of the polyurethane-based coating, In comparison with a coating material in which an acrylic or epoxy resin is used as a matrix, it is possible to form a film having high ductility and excellent heat resistance to a metal surface. Further, since the orthorhombic silicate mineral is contained, the formed film can be converted into far infrared rays and released, and has high heat dissipation properties.

The aqueous coating material according to the second aspect of the present invention is the first form of the present invention. In the aqueous coating material, the material constituting the fine particles of the polyurethane resin is selected from the group consisting of polycarbonate polyurethane, polyester polyurethane, aliphatic polyurethane, At least one of the group consisting of a fatty acid-modified polyurethane, an aromatic polyurethane, and a polyether polyurethane. In addition, the polycarbonate urethane is a polyurethane resin having a polycarbonate skeleton in its main chain. The "polyester polyurethane" is a polyurethane resin having a polyester skeleton in the main chain. The "aliphatic polyurethane" is a polyurethane resin having an aliphatic chain in its main chain. The "fatty acid modified polyurethane" is a polyurethane resin having a modified fatty acid skeleton in the main chain. The "aromatic polyurethane" is a polyurethane resin having an aromatic group in the main chain. The "polyether polyurethane" is a polyurethane resin having a polyether skeleton in the main chain.

When it is configured as described above, it becomes an aqueous coating material which can form a film which is more excellent in adhesiveness and heat resistance.

The water-based paint according to the third aspect of the present invention is the second form of the present invention. In the aqueous coating material, at least one of the materials constituting the fine particles of the polyurethane resin is a polycarbonate polyurethane or a polyester polyurethane.

When it is configured as described above, it becomes an aqueous coating material which can form a film which is especially excellent in adhesiveness.

The water-based paint according to the fourth aspect of the present invention is the first form of the present invention. In the aqueous coating material of any one of the first to third aspects, the average particle diameter of the polyurethane fine particles is from 10 nm to 500 nm. In addition, the "average particle diameter of 10 nm - 500 nm" is not limited to the primary particle diameter, and may be a particle diameter in agglomerated state.

When it is comprised as mentioned above, the microparticles of the polyurethane resin are easily dispersed in water.

Further, the average particle diameter is measured based on the particle size distribution by laser diffraction or scattering. That is, using Fraunhofer's diffraction theory and Mie scattering theory, the powder is divided into two parts by a wet method, and the particle size is large and the particle size is small. The side becomes the equivalent (volume basis) diameter as the median diameter.

The aqueous coating material according to the fifth aspect of the present invention is the first form of the present invention. In the aqueous coating material of any one of the fourth to fourth aspects, the solid material obtained by drying the dispersion of the polyurethane resin fine particles and water of the polyurethane resin fine particles has - Glass transfer point from 80 ° C to -20 ° C.

According to the configuration described above, the film formed of the aqueous coating material is excellent in flexibility and adhesion.

The aqueous coating material according to the sixth aspect of the present invention is the first form of the present invention. In the aqueous coating material of any one of the fifth to fifth forms, the orthorhombic silicate mineral is cordierite and/or mullite.

If constructed as described above, cordierite and/or mullite, especially far infrared Since the effect of releasing the wire is high, it becomes an aqueous coating which can form a film which is more excellent in heat dissipation effect.

The aqueous coating material according to the seventh aspect of the present invention is the first form of the present invention. And the aqueous coating material of any one of the sixth aspect, further comprising a second filler selected from the group consisting of boron nitride, aluminum nitride, tantalum carbide, cerium oxide, aluminum oxide, zinc oxide, At least one of a group consisting of titanium oxide, titanium black, and black lead is formed.

According to the configuration described above, the thermal conductivity of the film formed of the aqueous coating material can be improved, so that the heat dissipation effect of the film can be further improved.

The aqueous coating material according to the eighth aspect of the present invention is the seventh shape of the present invention. In the aqueous coating material, the first filler and the second filler are contained in an amount of 5 parts by weight to 150 parts by weight relative to 100 parts by weight of the polyurethane resin fine particles, relative to the weight of the first filler 100. In part, the second filler is from 1 part by weight to 150 parts by weight, and the first filler and the second filler are powders, and the average particle diameter is from 0.01 μm to 30 μm. In addition, the "average particle diameter is 0.01 μm to 30 μm" is not limited to the primary particle diameter, and may be a particle diameter in agglomerated state.

According to the configuration described above, since the average particle diameter is 0.01 μm or more, the thermal conductivity does not deteriorate. Further, since the average particle diameter is 30 μm or less, the surface of the formed film has no irregularities, and the operation of the coating liquid is easy, and the adhesion to the substrate is not impaired.

The aqueous coating material according to the ninth aspect of the present invention is the first form of the present invention In the aqueous coating material of any one of the eighth to eighth forms, the 5% mass loss temperature of the solid matter after drying is 270 ° C or higher.

When it is configured as described above, it is an aqueous coating material which can form a film excellent in heat resistance, and can be used in a higher temperature range, and therefore can be used in a member having a large amount of heat.

The aqueous coating material according to the tenth aspect of the present invention is the first aspect of the present invention. The water-based paint of any one of the form to the ninth form includes an antifoaming agent having a foam breaking property or a foam suppressing property.

According to the configuration described above, an aqueous paint having an effect of destroying (breaking) a temporarily generated bubble or suppressing generation of a bubble (suppression) can be obtained.

The heat dissipating member according to the eleventh aspect of the present invention is the first coating of the present invention. After the water-based paint of any one of the form to the tenth form, it is dried.

According to the configuration described above, it is possible to easily form a film having excellent heat dissipation properties (for example, the heat dissipation member 10 of FIG. 1) by drying the aqueous coating material which is easy to apply. As described above, the present invention can be formed into a film by drying, so that even in an aqueous coating material, film formation is extremely easy as compared with an aqueous coating material containing a resin requiring a heat hardening step or an active energy ray hardening step.

A metal component according to a twelfth aspect of the present invention includes a metal component body; The aqueous coating material of any one of the first aspect to the tenth aspect of the present invention is applied to the metal component body and then dried to form a film. In addition, the "metal component body" may also be a metal plate. Moreover, the "metal component body" may be a heat dissipating member, or it may be an assembly of the target article itself.

If it is configured as described above, heat transferred to the metal component body is easily transmitted to the film. Further, the film is easily released as far infrared rays.

The metal component according to the thirteenth aspect of the present invention is the twelfth of the present invention. In the metal component of the form, the metal component body is formed by including at least one selected from the group consisting of copper, iron, magnesium, aluminum, and alloys thereof.

According to the above configuration, the metal has a particularly high thermal conductivity, so that the heat dissipation effect can be improved.

An electronic device according to a fourteenth aspect of the present invention includes the a metal component of the 12th aspect or the 13th aspect; an electronic component having a heat generating portion; and the metal component body of the metal component is disposed on the electronic component so as to be in contact with the heat generating portion. In addition, the "heat generating portion" means a heat transfer to a metal component.

According to the configuration described above, the heat of the electronic component is easily transmitted to the metal component and further released as far infrared rays.

Since the water-based paint of the present invention is water-based, it is easy to handle, and the film formed from the paint has high heat dissipation properties and is excellent in heat resistance and adhesion.

10‧‧‧Heat components, membrane

11‧‧‧First filler

12‧‧‧Second filler

13‧‧‧Metal sheet

14‧‧‧Dissipating components with metal plates

20‧‧‧Electronic components

21‧‧‧ glass substrate

22‧‧‧Anode

23‧‧‧Electroluminescent layer

24‧‧‧ cathode

25‧‧‧Drying agent

26‧‧‧ Sealing body

27‧‧‧Adhesive

30‧‧‧Electronic components

40‧‧‧Motor body

41‧‧‧ outer surface

50‧‧‧Motor

60‧‧‧ battery body

70‧‧‧Battery

1 is a cross-sectional view of a heat dissipating member 14 including a film 10 and a metal plate 13 formed of the aqueous paint of the present application. Further, the film 10 formed of the aqueous paint of the present application can be used alone as the heat dissipating member 10. The membrane 10 includes a first filler 11 and a second filler 12.

2 is a view showing a preparation step (S01) of an aqueous coating material, and a film forming step Flow chart of (S02, S03).

FIG. 3 is a schematic cross-sectional view of the electronic component 30 including the heat dissipation member 14.

FIG. 4 is a view illustrating the shape of the metal plate 13 as a heat sink.

FIG. 5 is a schematic view of the motor 50 in which the heat radiating member 10 is formed on the outer surface 41 of the motor body 40.

FIG. 6 is a schematic view of a battery 70 in which a heat dissipating member 10 is formed on the outer surface of the battery body 60.

The present application is based on Japanese Patent Application No. 2013-094439, filed on Jan. The invention is further fully understood by the following detailed description. Further scope of applicability of the present invention will become apparent from the following detailed description. However, the detailed description and specific examples are preferred embodiments of the invention, and are described for the purpose of illustration only. It is apparent to those skilled in the art that various changes and modifications can be made in the spirit and scope of the invention. Applicants do not intend to provide any of the described embodiments to the public. Changes or alternatives that are not included in the scope of the patent application are also part of the invention under the principle of equivalence.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same or like numerals, and the repeated description is omitted. Further, the present invention is not limited to the following embodiments.

<Water-based paint>

The aqueous coating material according to the first embodiment of the present invention comprises: a polyurethane resin fine particle; a first filler formed of an orthorhombic silicate mineral emitting far infrared rays; and dispersing the polyamine group The acid ester resin disperses the particles and the water of the first filler.

<<Polyurethane resin dispersed particles>>

The polyurethane resin fine particles may be selected from the group consisting of polycarbonate polyurethanes, polyester polyurethanes, aliphatic polyurethanes, fatty acid modified polyurethanes, At least one particle of the group consisting of an aromatic polyurethane and a polyether polyurethane.

The polyurethane is preferably excellent in heat resistance and adhesion to a metal or the like, and the polyurethane is preferably a film which is particularly excellent in heat resistance and adhesion. It is preferable that the polycarbonate urethane and/or the polyester urethane are contained in the constituent elements of the polyurethane fine particles.

The average particle diameter of the polyurethane resin fine particles is preferably from 10 nm to 500 nm. More preferably, it is 10 nm to 100 nm. When the average particle diameter is 10 nm or more, aggregation in water is less likely to occur. Further, when it is 500 nm or less, it becomes dispersible in water.

The glass transition temperature of the solid obtained by drying the dispersion containing the polyurethane fine particles and water is preferably -80 ° C to -20 ° C. More preferably -55 ° C ~ -30 ° C. When the glass transition temperature is -80 ° C or more, the coating film strength can be maintained, so that it is difficult to be damaged and the drying property is excellent. When it is -20 ° C or less, the effect of preventing cracks is obtained due to moderate flexibility. In addition, the lower the glass transition temperature, the more the adhesion between the film formed by the aqueous coating and other substances (for example, metal) is improved. good.

<<Orthorhombic silicate mineral>>

Examples of the orthorhombic silicate minerals as the first filler include mullite, cordierite, pyroxene, heteropolar ore, zoisite, sillimanite, and andalusite. These fillers are excellent in heat radiation and far-infrared radiation, and improve heat dissipation of a film formed of an aqueous paint. In particular, cordierite or mullite is preferred in that the infrared light emission effect is high, light, chemically stable, and affinity with a resin is also high. In addition, the orthorhombic silicate mineral may be any of natural and artificial. The water-based paint contains at least one of these fillers. Further, in terms of storage stability or weather resistance, a filler having water resistance and being difficult to generate hydrolysis is preferred. The crystal system of the phthalate mineral used in the present invention is an orthorhombic system, and in the case of a natural mineral, it may also comprise a monoclinic or triclinic mineral, and further comprises a cubic system. Minerals such as impurities. Further, the mineral may contain mica, montmorillonite, black lead (including graphite), kaolin, bentonite, or the like as long as the effects of the present invention are not significantly impaired. The crystal growth method in the case of artificially obtained is not limited, and a known method can be used. When the crystal growth is performed artificially, a trace amount of metal may be added to an effect of increasing the amount of energy or the amount of energy released in a range that does not interfere with the emission characteristics of far infrared rays.

It is also possible to add a second filler in a form added to the first filler. The second filler is preferably at least one selected from the group consisting of boron nitride, aluminum nitride, tantalum carbide, cerium oxide, aluminum oxide, zinc oxide, titanium oxide, titanium black, and black lead. In particular, boron nitride, aluminum oxide, and zinc oxide have high thermal conductivity and can be formed by water-based paints. The heat dissipation effect of the formed film is further improved and is preferred. Further, cerium oxide is preferred because it can adjust the viscosity of the aqueous coating material and has a drip prevention effect. Titanium oxide can be uniformly dispersed in a coating material and colored in white. Titanium black and black lead can be uniformly dispersed in a coating material and colored in black, which is preferable because it can improve design. Further, a plurality of first fillers having different particle diameters may not be added as the second filler. At this time, the first filler may be the same filler or different.

The shape of the first filler and the second filler is preferably a powder, a paste, a wire or the like. In particular, in view of obtaining a uniform state from the dispersion of water, it is preferably mixed as a powder in an aqueous coating material. In the case of a powder, the average particle diameter is preferably from 0.01 μm to 30 μm. More preferably, it is 0.05 μm to 25 μm. Further preferably, it is 0.08 μm to 20 μm. When it is 0.01 μm or more, the viscosity of the aqueous coating material is not too high, and the workability in the coating step is good. Moreover, the thermal conductivity does not change. When it is 30 μm or less, irregularities are not formed on the surface of the film formed of the aqueous paint. Further, there is no phenomenon that the sedimentation of the filler is fast and the storage stability of the aqueous coating material is deteriorated.

Further, when the average particle diameter of the first filler and the second filler is larger than the average particle diameter of the polyurethane fine particles, the fillers are easily brought into contact with each other and the thermal conductivity is improved, which is preferable. Further, when the second filler is added for the coloring application, if particles having an average particle diameter smaller than that of the first filler are used, it is easy to uniformly disperse and does not hinder the contact of the first fillers, and thus does not impair heat conduction. Sexually better.

When the total amount of the first filler and the second filler is 5 parts by weight to 150 parts by weight based on 100 parts by weight of the urethane resin fine particles, good results are obtained. Cooling effect. In consideration of the work efficiency of the step of applying the aqueous coating material, the total amount of the first filler and the second filler is preferably from 10 parts by weight to 120 parts by weight based on the fine particles of the polyurethane resin. When the total amount of the filler is 5 parts by weight or more, the heat dissipation characteristics of the filler can be sufficiently obtained. Moreover, when it is 150 parts by weight or less, there is no problem that the viscosity of the coating material is excessively increased to impair the workability, and there is no problem that the filler aggregates in the aqueous coating material. Further, in the case of mixing the second filler, it is preferred to mix 1 part by weight to 150 parts by weight of the second filler with respect to 100 parts by weight of the first filler.

<<Additives>>

A dispersant/antifoaming agent/coloring pigment/decane coupling agent/surface conditioning agent may further be added as an additive to the aqueous coating.

The dispersing agent may use a carboxyl group containing a hydroxyl group, a salt of a long-chain polyamine decylamine with a high molecular weight acid ester, a salt of a high molecular weight polycarboxylic acid, a salt of a long-chain polyamine guanamine and a polar acid ester, and a high molecular weight. Unsaturated acid ester, polymer copolymer, modified urea, modified polyurethane, modified polyacrylate, polyether ester type anion activator, naphthalenesulfonic acid formalin condensate salt, aromatic sulfonate Acid formalin condensate salt, polyoxyethylene alkyl phosphate, polyoxyethylene nonylphenyl ether, polyethylene oxide monoalkyl ether, stearyl acetate. By adding 1 part by weight to 35 parts by weight of a dispersant to 100 parts by weight of the filler, it is possible to prevent aggregation of the filler and improve storage stability of the aqueous coating material.

Examples of the antifoaming agent include an anthrone-based defoaming agent, a modified anthrone-based defoaming agent, a ceria-based antifoaming agent, a wax, a polyoxyalkylene oxide, a polyether-modified polydimethyloxane, and a foam breaking agent. A polymer, a paraffinic oil, a foaming aliphatic derivative, and the like. By relative to waterborne coatings When 100 parts by weight of 0.01 to 5 parts by weight of the antifoaming agent is added, the defoaming property can be exhibited, and the workability of the coating step of the aqueous coating material can be improved. By adding an antifoaming agent, it is possible to obtain an aqueous coating material having an effect of destroying a bubble (breaking) which is temporarily formed or suppressing the formation of a foam (inhibition of foam), so that the adhesion (film formation property of the coating film) can be improved.

As the coloring pigment, an organic pigment and an inorganic pigment can be used. Preferred are inorganic pigments.

As the decane coupling agent, a commercially available coupling agent can be used. Among them, preferred is a decane coupling agent Sila-Ace (registered trademark) manufactured by JNC Co., Ltd. (S330, S510, S520, S530). By adding 1 part by weight to 10 parts by weight of a decane coupling agent to 100 parts by weight of the polyurethane resin fine particles, the adhesion between the metal plate and the film formed of the aqueous coating material can be improved.

Examples of the surface conditioning agent include organically modified polyoxyalkylene oxide, alkyl modified polyoxyalkylene oxide, acrylic copolymer, surface active polymer, acrylic copolymer, hydrazine-modified acrylic acid, and alcohol alkoxylate. By adding 0.001 part by weight to 10 parts by weight of the surface conditioning agent to 100 parts by weight of the aqueous coating material, the leveling effect or wettability can be improved, and the smoothness and the like can be exhibited, and the workability and film of the coating step of the aqueous coating material can be improved. Improved features.

The water-based paint is prepared by adding a powder of a first filler (a second filler is added as needed) to a dispersion (dispersion liquid) of water containing fine particles of the polyurethane resin, and using a stirrer such as a spinning or a revolution mixer. Stir, defoam, and mix until the degree of aggregation of the filler is eliminated (Fig. 2, S01). For example, after stirring at a rotation speed of 2000 rpm for 10 minutes, defoaming was performed at a rotation speed of 2,200 rpm for 10 minutes.

When mixing, an additive such as a dispersant may be added as needed, or a second filler may be added to adjust the viscosity of the aqueous coating according to the coating method. In order to contribute to the dispersion of the fine particles of the polyurethane resin in water, a small amount of an organic solvent such as 1-methyl-2-pyrrolidone (NMP) or a glycol may be further added and mixed.

Further, the amount of water in the dispersion (dispersion liquid) of water containing the fine particles of the polyurethane resin can be appropriately changed depending on the properties of the resin. That is, it is sufficient to disperse the fine particles of the polyurethane resin. For example, it is 40 parts by weight or more with respect to 100 parts by weight of the urethane resin fine particles.

As described above, since the aqueous coating material of the present application uses water as a solvent, it is easier to handle as a coating material than the organic solvent, and handling is also easy. In addition, it can also be a countermeasure against volatile organic compounds (VOC). Further, since the aqueous coating material of the present invention is water, it can also be used on the surface of a resin which is soluble in an organic solvent or the like. The aqueous coating material of the present invention can easily form a film having heat dissipation properties by drying after coating.

<heat dissipation member 10>

The heat dissipating member according to the second embodiment of the present invention is a film formed of the aqueous coating material according to the first embodiment of the present invention. The film of the heat radiating member 10 as shown in FIG. 1 can be easily obtained by applying an aqueous coating material and drying it.

The method of applying the aqueous coating (Fig. 2, S02) is preferably a wet coating method in which an aqueous coating is uniformly applied. In the wet coating method, in the case of a small amount, it is preferred to use a spin coating method in which a homogeneous film can be easily formed. In the case where productivity is important, gravure coating, die coating, bar coating, and reverse coating are preferred. Method, roll coating method, slit coating method, dipping method, spray coating method, conformal coating method, reverse matching coating method, air knife coating method, curtain coating method, bar coating method, and the like. The wet coating method can be suitably selected from these methods depending on the desired film thickness, viscosity, drying conditions, and the like.

Further, it is preferred to apply the aqueous coating material so that the film thickness after drying is from 0.1 μm to 1000 μm. More preferably, it is 10 μm to 100 μm, and still more preferably 20 μm to 50 μm. When the thickness is 10 μm or more, the thicker the emissivity is, the higher the heat dissipation effect is. When it is 100 μm or less, the thinner the thermal conductivity, the larger the thermal conductivity. Therefore, an appropriate film thickness can be selected depending on the use.

After coating, the coating film is dried to remove moisture, and the aqueous coating material is cured to form a film (Fig. 3, S03). The drying may be carried out by natural drying at a normal temperature, hot air from a dryer or the like, or by heat drying using a machine such as a drying oven. Drying requires removal of moisture to the extent that the aqueous coating loses fluidity.

Further, the formed film (solid matter) contains an orthorhombic tellurite mineral having high thermal conductivity and high thermal activity. Therefore, if a film is formed on a metal or the like having a high thermal conductivity used in the heat sink, the heat radiation from the metal surface can be increased, and the temperature of the metal itself can be lowered. Although the heat of the metal of the heat sink can be sufficiently moved, if the thermal conductivity of the adjacent substance is low, heat is hard to be transmitted to the substance (for example, air or the like). Therefore, by coating the water-based paint of the present application having high heat radiation, it is possible to efficiently radiate far infrared rays to the atmosphere.

In addition, the film contains a polyurethane resin. Therefore, it is excellent in heat resistance, and the 5% mass loss temperature is 270 ° C or more. Moreover, it is excellent in the adhesiveness with respect to a metal surface. and, Since the ductility is also excellent, it becomes possible to carry out processing after painting.

As described above, the film formed of the aqueous paint of the present application functions as a heat dissipating member. If the film is formed on a metal or a non-metal having a lower emissivity than the film, the heat of the absorbing metal or non-metal converts it into far infrared rays and radiates to the outside, thereby lowering the temperature.

For example, the aqueous coating of the present application may be applied to the metal component body to be dried to form a metal component including a film having heat dissipation properties. Examples of the metal to be coated include copper, iron, magnesium, aluminum, and alloys thereof. These metals have high thermal conductivity and are particularly good.

As shown in FIG. 1, the metal component body can also be a metal plate 13 having a high thermal conductivity. When a film is formed on the metal plate 13, a heat radiating member 14 having a metal plate can be formed.

The thickness of the metal plate of the heat dissipating member 14 is 0.03 mm to 100 mm, preferably 0.1 mm to 10 mm, and more preferably 0.2 mm to 2 mm. In the case where the heat source is small and the area of the metal plate is sufficiently large, the thicker the heat is, the higher the heat dissipation effect is. When it is 0.03 mm or more, the heat dissipation effect is excellent. Further, when it is 100 mm or less, it is preferable in terms of light weight.

For example, FIG. 3 is a schematic cross-sectional view of an electronic component 30 as an electronic device in which a heat dissipating member 14 is placed on the sealing body 26 of the electronic component 20 so as to contact the metal plate 13 of the heat dissipating member 14. As described above, the heat radiating member 14 is placed on the upper surface of the electronic component 20 to function. That is, the heat radiating member 14 is placed on the surface of the sealing body 26, and the heat transferred from the sealing body 26 is released to the outside to remove heat from the electronic component 20. Using the heat dissipating member 14 for, for example, electronics In the case of an electronic device such as the element 20, the thickness of the metal plate 13 is 0.01 mm to 100 mm. It is preferably 0.03 mm to 10 mm, more preferably 0.1 mm to 2 mm. The thickness of the film 10 of the heat dissipation member 14 is 0.1 μm to 1000 μm. It is preferably 10 μm to 100 μm, more preferably 20 μm to 50 μm. In the case where the heat dissipating member 14 is used as a heat dissipating plate for an electronic component, it is preferable because the heat dissipating effect is high if it has a certain thickness.

Further, the heat radiating member 14 may be attached so as to cover the surface of the sealing body 26. By covering the heat dissipating member 14 of the entire sealing body 26, the heat efficiency from the inside of the electronic component to the sealing body 26 can be more efficiently released to the outside.

In addition, the heat dissipation member 14 may be attached to the electronic component 20 using an adhesive. The adhesive is preferably an acrylic, an anthrone or an epoxy adhesive. Alternatively, the heat dissipating member 14 may be fixed to the electronic component 20 using a double-sided fixture or a buckle. In other words, the metal plate 13 provided in the heat dissipation member 14 may be fixed by being in close contact with the electronic component 20.

FIG. 3 is an example of use of the heat radiating member 14 in which the film 10 is formed on the flat metal plate 13. However, the shape of the metal plate 13 and the film 10 is not limited to this, and the shape in which the surface area becomes larger may be set to increase the area in contact with the outside air.

As shown in FIG. 4, the metal component body may also be a conventional metal heat dissipating member such as the heat sink 13. When a film is formed on the surface of the heat sink 13, the performance of the heat sink 13 can be improved (the film 10 is not shown).

Further, in the case where the aqueous coating of the present application is applied to a metal plate having a shape as shown in FIG. 4, it is adjusted by a spray coating method to have a low viscosity. The aqueous coating is applied by dipping, that is, the metal sheet is impregnated in an aqueous coating adjusted to an appropriate concentration.

The metal component body may also be part of the article itself.

For example, as shown in FIG. 5, the metal component body may also be an outer surface of the motor 50 for an electric vehicle. FIG. 5 is a schematic view of the electric motor motor 50 in which the film 10 as a heat dissipating member is directly coated with the water-based paint of the present application and dried on the outer surface 41 of the motor main body 40. The motor body 40 that converts electrical energy into mechanical energy generates heat as it operates, and this heat needs to be excluded from the motor. The film 10 functions as a film on the outer surface 41 of the motor body 40. That is, the film 10 absorbs heat transferred from the outer surface 41 of the motor body 40, and the heat is transferred into the film and further radiated to the outside air as far infrared rays, thereby performing heat generated in the motor body 40. Cooling.

Moreover, not only the water-based paint is applied to the outer surface of the motor 50, but also the water-based paint can be applied to the inner surface. In this manner, the film formed on the inner surface functions as a far infrared ray generated from the heat source inside the motor 50 from the inside, and the heat radiation effect is further improved.

Alternatively, the metal component body may be a metal plate, and the heat dissipation member 14 (refer to FIG. 1) having the metal plate is placed on the outer surface of the motor body 40. When the heat radiating member 14 is used in an apparatus such as a motor for an electric vehicle, the thickness of the metal plate provided in the heat radiating member 14 is usually 0.01 mm to 100 mm. It is preferably 0.03 mm to 10 mm, more preferably 0.1 mm to 2 mm. The thickness of the film provided in the heat radiating member 14 is usually 0.1 μm to 1000 μm. It is preferably 10 μm to 100 μm, more preferably 20 μm to 50 μm. The electric motor of the electric car has a large output power and is in driving The rotation is straight, so that the amount of heat generation is large, and heat is efficiently removed by the heat dissipating member of the present application.

Further, the heat dissipating member of the present application is not limited to a motor for an electric vehicle, and can be used in a general motor. Particularly in the case where the motor is to be made light and small, it is effective to use the heat dissipating member of the present application.

The metal component body may also be part of the article itself.

For example, as shown in FIG. 6, the metal component body may be an outer surface of the battery 70 for an electric vehicle that activates the engine to operate the power component. FIG. 6 is a schematic view showing a battery 70 in which a film 10 as a heat dissipating member is directly coated on the outer surface of the battery main body 60 and directly coated with the aqueous coating material of the present application. The battery body 60, which has a problem of self-heating during charging or discharging, needs to discharge the generated heat to the outside of the battery body. The film 10 functions as a film on the outer surface of the battery body 60. That is, the film 10 absorbs heat transferred from the surface of the battery body 60, and the heat is transferred to the inside of the film, and is further radiated to the outside air as far-infrared rays, thereby dissipating heat generated in the battery body 60.

Moreover, not only the water-based paint is applied to the outer surface of the battery 70, but also the water-based paint can be applied to the inner surface. In this case, the film formed on the inner surface functions to absorb heat inside the battery 70 from the inside by far infrared rays, and the heat radiation effect is further improved.

In addition, the battery body 60 may be a battery unit or an assembly thereof.

Further, the battery body 60 may be, for example, a battery for an electric vehicle that causes the engine to start up to operate the power module normally.

Alternatively, the metal component body may be a metal plate, and the heat dissipation member 14 (see FIG. 1) having the metal plate is placed on the outer surface of the battery body 60. When the heat radiating member 14 is used in an apparatus such as a battery for an electric vehicle, the thickness of the metal plate provided in the heat radiating member 14 is usually 0.01 mm to 100 mm. It is preferably 0.03 mm to 10 mm, more preferably 0.1 mm to 2 mm. The thickness of the film provided in the heat radiating member 14 is usually 0.1 μm to 1000 μm. It is preferably 10 μm to 100 μm, more preferably 20 μm to 50 μm.

Further, the heat dissipating member of the present application is not limited to a battery for an electric vehicle, and may be used in a battery in which self-heating at the time of charging or discharging is a problem.

In addition, the heat dissipating member 10 and the heat dissipating member 14 may be used in a central processing unit (CPU) of a smart phone (smartphone) or a personal computer (PC), or a battery, a lighting fixture, a work machine, or the like. It is used in articles such as heating appliances and machinery to provide high heat dissipation.

The heat dissipating member of the present invention can have a high heat dissipation effect by a film obtained by drying a dispersion of water containing fine particles of a polyurethane resin and a filler, or by a combination of a film and a metal plate. Further, since the heat dissipating member and the article can be manufactured in steps, and the heat dissipating member can be easily placed on the article, the manufacturing is easy, and the production efficiency can be improved.

[Examples]

Hereinafter, the present invention will be described in detail using examples. However, the present invention is not limited to the contents described in the following embodiments.

The constituent materials constituting the heat dissipating member used in the embodiment of the present invention are as follows.

<Aqueous polyurethane resin dispersion liquid>

. Polyester-polyurethane resin dispersion:

PESU1: Sumika Bayer Urethane Co., Ltd. (trade name) Bayhydrol UH2342 (containing 5% by weight of 1-methyl-2-pyrrolidone)

PESU2: Baying Polyurethane Co., Ltd. (trade name) Bayhydrol UH650

. Polycarbonate-Polyurethane Resin Dispersion: PCU1: Baying Polyurethane Co., Ltd. (trade name) Bayhydrol UH2606

. Polyester-polycarbonate-polyurethane resin dispersion:

PECU1: Baying Polyurethane Co., Ltd. (trade name) Bayhydrol UHXP2648

PECU2: Baying Polyurethane Co., Ltd. (trade name) Bayhydrol UHXP2648/1

(Bayhydrol is a registered trademark)

The catalog value of the aqueous polyurethane resin dispersion liquid used in the examples is shown.

Table 1: Catalog Values of Aqueous Polyurethane Resin Dispersions

Represents the aqueous polyurethane resin dispersion used in the examples The measured value of the liquid.

<Comparative resin or resin dispersion liquid>

. Acrylic resin (aqueous): Water-based polishing varnish of Hexin Coatings Co., Ltd. (trade name)

. Acrylic resin (thermosetting): East Asia Synthetic Co., Ltd. (trade name) ARONIX M-305

. Alkyd (Polyester) Resin (Oil): Hexin Paint Co., Ltd. (trade name) Clear lacquer

. Epoxy resin (photocuring): Daicel Co., Ltd. (trade name) Celloxide 2021P

<filler>

. Synthetic cordierite: Pill glaze drug joint company (trade name) SS-200 (average particle size 7.5 μm) SS-1000 (average particle size 1.7 μm) SS-5000 (average particle size 0.6 μm)

. Boron Nitride: Electric Chemical Industry Co., Ltd. DENKA Boron Nitride (trade name) SGP

. Silica: Fuji Silysia Co., Ltd. Product Name) Sylysia

. Alumina: Showa Denko Co., Ltd. (trade name) AL-47H

. Titanium Oxide: Ishihara Industry Co., Ltd. (trade name) TIPAQUE CR-50

. Tantalum carbide: Sigma-Aldrich Japan (trade name) Silicon Carbide

. Black lead: Japan Black Lead Industrial Co., Ltd. (trade name) scaly black lead powder F#2

. Titanium black: manufactured by Mitsubishi Materials Co., Ltd., 13M-C

(ARONIX, Celloxide, DENKA Boron Nitride, TIPAQUE are registered trademarks)

<cation generator>

. CPI-210S: Sanya Pro (san-apro) Co., Ltd.

<Measurement of particle size distribution>

The average particle diameter (median diameter) of each particle can be measured using a laser diffraction scattering type particle size distribution measuring apparatus LA-950V2 manufactured by Horiba. That is, using the analysis of the Fraun and Fiji diffraction theory and the Mie scattering theory, the wet method is used to measure the powder from a certain particle size into two parts, and the side of the large particle size and the particle size are small. The side becomes the equivalent (volume basis) diameter as the median diameter. The measurement is a wet method, and a sample obtained by measuring a sample in a small amount of water (about 1 scoop of a spoon) and then treating it in an ultrasonic cleaner for 3 minutes to disperse the sample. The concentration of the slurry at the time of measurement was adjusted so that the transmittance of the laser was 80%.

<sample preparation>

Using a self-rotating, revolutionary mixer (manufactured by Thinky Co., Ltd.) The defoaming stirring Taro ARE250) was carried out by stirring the aqueous polyurethane resin dispersion liquid and the filler powder at a rotation speed of 2000 rpm for 10 minutes, and then defoaming at a rotation speed of 2200 rpm for 10 minutes, thereby preparing the following sample.

<<Example 1>>

15 parts by weight of PESU1 and 15 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm were weighed and placed in a polypropylene container, and mixed by a rotation and a revolving mixer to prepare an example. 1 sample.

<<Example 2>>

100 parts by weight of PESU2 and 21.4 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm were weighed and placed in a polypropylene container, and mixed by a rotation and a revolving mixer to prepare an example. 2 samples.

<<Example 3 to Example 5>>

The samples of Examples 3 to 5 were prepared in the same manner as in Example 1 except that the type of the aqueous polyurethane resin dispersion liquid was different.

<<Comparative example 1>>

100 parts by weight of an acrylic resin (aqueous) paint and 15 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm were weighed and placed in a polypropylene container, and rotated by a rotation and a revolving mixer. The sample of Comparative Example 1 was prepared by mixing.

<<Comparative Example 2>>

100 parts by weight of an acrylic resin (thermosetting property) and 42.9 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm were weighed and placed in polypropylene. The sample of Comparative Example 2 was prepared by mixing in a container by a rotation and a revolution mixer.

<<Comparative Example 3>>

100 parts by weight of an alkyd resin coating (oily) and 15.9 parts by weight of a synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm were weighed and placed in a polypropylene container, and rotated by a rotation/revolution mixer. The sample of Comparative Example 3 was prepared by mixing.

<<Comparative Example 4>>

70 parts by weight of epoxy resin (photocuring), 30 parts by weight of synthetic cordierite (SS-200) having an average particle diameter of 7.5 μm, 30 parts by weight of methyl ethyl ketone (MEK), and CPI-210S0. 3 parts by weight was placed in a polypropylene container and mixed by a rotation/revolution mixer to prepare a sample of Comparative Example 4.

<<Example 6>>

Weighing 35 parts by weight of PECU1 and 35 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm, and placing it in a polypropylene container, by spinning, The sample of Example 6 was prepared by mixing with a revolution mixer.

<<Comparative Example 5, Comparative Example 6>>

Samples of Comparative Example 5 and Comparative Example 6 were prepared in the same manner as in Example 6 except that the types of the fillers were different.

<<Comparative Example 7>>

Only PECU1 is used as a sample.

<<Comparative Example 8>>

Only the black alumite treatment (using a black alumite treatment on one side of the aluminum plate used in the following [1. Evaluation of heat dissipation characteristics]) was carried out.

<<Example 7 to Example 27>>

Further, in order to adjust the color or improve the heat dissipation effect, cordierite (SS-200) having an average particle diameter of 7.5 μm as a first filler and a second filler were added. The ratio of the amount of the aqueous polyurethane resin dispersion liquid and the filler added is as follows. The preparation procedure of the sample was the same as in Example 6. Further, in Example 7, Example 14, and Example 21, cordierite having a particle diameter different from that of the first filler is used in combination, and does not substantially contain the second. Although the composition of the filler was used, for the sake of convenience, in Table 6, the cordierite having a different particle diameter is described in the second filler column.

<<Comparative Example 9 to Comparative Example 11>>

Alumina as a first filler and titanium oxide as a second filler are added. The ratio of the amount of the aqueous polyurethane resin dispersion liquid and the additional filler added is as follows. The preparation procedure of the sample was the same as in Example 6.

[1. Evaluation of heat dissipation characteristics]

The evaluation of the heat dissipation characteristics was shown about the examples and the comparative examples.

[1-1 Preparation of Heat Dissipating Member]

Each of the samples of the examples and the comparative examples was applied to an aluminum plate having a thickness of 0.4 mm in a square shape of 40 × 40 (mm) using a spin coater. The number of revolutions of the spin coater was adjusted so that the coating film of each of the examples and the comparative examples was about 30 μm. The film thickness can be measured using DIGIMICRO MFC-101A manufactured by Nikon Corporation.

Using a hot plate, heating was performed at 130 degrees for 3 minutes, and each sample of the applied examples and the comparative examples was dried to form a heat dissipating member having an aluminum plate.

The heat dissipating member of Comparative Example 2 was applied to an aluminum plate having a thickness of 0.4 mm by spin coating using a square of 40 × 40 (mm), and then hardened by a hot plate of 190 degrees. A heat dissipating member having an aluminum plate is formed.

The heat dissipating member of Comparative Example 4 was applied to an aluminum plate having a thickness of 0.4 mm by spin coating using a square of 40 × 40 (mm), and then hardened by an ultraviolet ray irradiator to form a heat-dissipating member. A heat dissipating member having an aluminum plate.

The heat dissipating member of Comparative Example 7 was obtained by applying only PECU 1 to an aluminum plate and then drying it. The heat dissipating member of Comparative Example 8 was obtained by a black alumite treatment on one side of an aluminum plate without a resin.

[1-2 Evaluation of heat dissipation characteristics I]

The aluminum surface side of the heat dissipating member was bonded to a transistor (Silicon NPN, Triple Diffusion, 2SD2012 manufactured by Toshiba Crystal Co., Ltd.) using a double-sided tape (thermal conductive adhesive transfer tape No. 9885 manufactured by Sumitomo 3M Co., Ltd.) . K thermocouple is attached to the back surface of the surface of the transistor to which the heat dissipating member is bonded (manufactured by Physicochemical Co., Ltd.) ST-50), using a data logger to record its temperature by a personal computer. The heat dissipating member to which the transistor was mounted was placed in the center of a thermostatic chamber set at 40 ° C, and it was confirmed that the temperature of the transistor was 40 ° C and fixed, and then 1.18 V was applied to the transistor using a DC stabilized power source, and the transistor was measured. The temperature of the surface changes.

Heat-dissipating members were prepared using the samples of Examples 1 to 5 and Comparative Examples 1 to 4, and the heat dissipation characteristics were evaluated. The evaluation results are as follows.

According to the results shown in Table 7, the heat dissipating members using the aqueous coating materials of Examples 1 to 5 of the present invention have excellent heat dissipation properties as compared with Comparative Examples 1 to 4. Further, according to the results of the heat dissipation test using the aqueous coating materials of Examples 1 to 5, the type of the resin is particularly preferably polycarbonate-polyurethane, polyester-polyurethane, polyester- Polycarbonate-polyurethane.

[1-3 Evaluation of heat dissipation characteristics II]

Using double-sided tape (thermal conductivity adhesive made by Sumitomo 3M Co., Ltd.) Printing tape No. 9885) The metal surface side of the heat dissipating member was bonded to a ceramic heater (micro ceramic heater MS-3 manufactured by Sakaguchi Electric Co., Ltd.). A K thermocouple (ST-50 manufactured by Physicochemical Co., Ltd.) was attached to the back surface of the surface of the ceramic heater to which the heat dissipating member was attached, and the temperature was recorded by a personal computer using a data logger. The heat dissipating member to which the heater is attached is placed in the center of the thermostatic chamber set at 40 ° C, and after confirming that the temperature of the ceramic heater is 40 ° C and is fixed, 14 V is applied to the ceramic heater using a DC stabilized power source, and the ceramic is measured. The temperature of the heater surface changes. The ceramic heater generates a certain amount of heat, so the higher the heat dissipation effect of the mounted heat dissipating member, the lower the temperature of the ceramic heater. That is, it can be said that the heat dissipation effect of the heat dissipation member whose ceramic heater temperature becomes lower is higher.

Heat-dissipating members were prepared using the samples of Examples 6 to 27 and Comparative Examples 5 to Comparative Examples 11, and the heat dissipation characteristics were evaluated. The evaluation results are as follows.

According to the results shown in Table 8, it is understood that the heat dissipating member using the aqueous paint of the present invention has excellent heat dissipation properties. According to the results shown in Table 9, the heat dissipating member using the water-based paint of the present invention does not impair the heat dissipation performance even if the second filler is added, and in particular, the thermal conductivity of boron nitride and aluminum oxide is high, so that it can be formed by the water-based paint. The heat dissipation effect of the film is further improved, so that it is preferable. Moreover, titanium oxide can be uniformly dispersed In the coating, it is preferred to color the coating film to white. Titanium black can be uniformly dispersed in the coating to make the coating film black, which is preferable.

[2. Evaluation of membrane properties]

The evaluation of the physical properties of the film is shown in the examples and comparative examples. The sample used in [2. Evaluation of film physical properties] was the same as that of the user in [1. Evaluation of heat dissipation characteristics].

[2-1 Evaluation of heat resistance]

The sample was poured into an aluminum cup and dried at room temperature for 24 hours. Further, the thickness of the coating film was adjusted so as to be 1 mm after drying. The coating film was cut out, and the 5% mass loss temperature of the coating film was measured using a differential heat/thermogravimetry simultaneous measuring apparatus EXSTAR TG/DTA6000 series (manufactured by SII NanoTechnology Inc.).

According to the results, it is understood that the coating film formed from the aqueous coating material of the present invention has excellent heat resistance. Therefore, it can be used in a higher temperature range. and, If Example 1 containing a cosolvent is compared with Examples 2 to 5 containing no cosolvent, it is preferred that no cosolvent is placed; if Examples 2 to 5 and Comparative Examples are used 1. Comparing Comparative Example 3 with Comparative Example 4, preferred are Examples 2 to 5, the polyester-polyurethane of Example 2, and the polycarbonate-polyamine group of Example 3. The formate or the polyester-polycarbonate-polyurethane of Examples 4 and 5 is particularly preferred. Further, the thermosetting acrylic paint cured film (Comparative Example 2) is excellent in heat resistance, but the volume shrinkage due to heating is large, and cracks are generated and peeled off from the substrate, which is not preferable.

[2-2 Evaluation of film adhesion]

The sample was coated by a spin coater on an aluminum plate having a thickness of 0.4 mm, a copper plate having a thickness of 0.4 mm, a magnesium plate having a thickness of 1.2 mm, and a stainless steel plate having a thickness of 0.2 mm, and was subjected to a spray at 130 ° C for 3 minutes. Heat dried. Further, the thickness of the coating film was adjusted so as to be 30 μm after drying. The adhesion test was performed by cutting a 100-mesh incision at 10 × 10 in accordance with JIS-K5600-5-6, and using TQC ISO Adhesive Tape/STANDARD (manufactured by Gotec Co., Ltd.) to determine the presence or absence of peeling of the coating film. The case where the number of the unpeeled cells is 90 or more is taken as ○, the case where 70 or more is not peeled is taken as Δ, and the case where less than 70 is used is taken as Δ.

The results of the adhesion test of the coating film formed by using the samples prepared in Examples 2 to 4 and Comparative Examples 1 to 4 are shown below.

According to the results, it is understood that the coating films formed from the aqueous coating materials of the present invention have excellent substrate adhesion. Further, the coating film of the polycarbonate-polyurethane and the polyester-polyurethane is extremely excellent in adhesion to any substrate, and is particularly preferable. Since it is excellent in the adhesiveness with a base material, it heat-transfers efficiently from a heat-generating part, and can obtain high heat-dissipation performance.

[2-3 Evaluation of bending resistance]

The results of the bending resistance test of the coating film formed by using the samples prepared in Examples 2 to 4 and Comparative Examples 1 to 4 are shown below. The sample was coated on an aluminum plate having a thickness of 0.4 mm by a spin coater, and dried by heating at 130 ° C for 3 minutes. Further, the thickness of the coating film was adjusted so as to be 30 μm after drying. In the bending resistance test, when the aluminum plate was bent by 90 degrees on the outer side of the coating film surface, the case where no crack occurred on the coating film was taken as ○, and the crack was generated as ×.

According to the results, it is understood that the coating film formed of the aqueous coating material of the present invention has extremely excellent bending resistance in any of Examples 2 to 4. Therefore, it can be subjected to stamping or bending processing after being applied to a substrate.

[2-4 Evaluation of Scoring Hardness]

The results of evaluation of the coating film hardness of the coating film formed by using the samples prepared in Examples 2 to 4 are shown below. The sample was coated on an aluminum plate having a thickness of 0.4 mm by a spin coater, and dried by heating at 130 ° C for 3 minutes. Further, the thickness of the coating film was adjusted so as to be 30 μm after drying. The method of the score hardness test is based on JIS-K-5-4.

From the results, it is understood that the polycarbonate-polyurethane of Example 3 and the polyester-polycarbonate-polyurethane of Example 4 have excellent scoring hardness even if they have flexibility. Therefore, it is difficult to scratch. Further, since the scratch film formed by the water-based paint of the present invention is also temporarily scratched and the flaw is not conspicuous, it is also excellent as an external paint. The thermosetting acrylic paint cured film (Comparative Example 2) is excellent in scoring hardness, but has poor adhesion to a substrate and is peeled off from the substrate, which is not preferable.

By producing various coating materials containing a polyurethane resin dispersion liquid and a filler, film properties such as adhesion, hardness, and bending strength of the coating film can be adjusted.

[3. Evaluation of coating properties]

The evaluation of physical properties of various coating materials containing a polyurethane dispersion liquid and a filler is shown. The sample used in [3. Evaluation of coating physical properties] was the same as that of the user in [1. Evaluation of heat dissipation characteristics].

<<Example 28>>

Weigh 75 parts by weight of PESU2, 25 parts by weight of PECU1, and 19.8 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm, placed in a polypropylene container, and mixed by a rotation and revolution mixer. The sample of Example 28 was prepared.

<<Example 29 to Example 33>>

The test of Example 29 to Example 33 was carried out in the same manner as in Example 28 except that the type of the aqueous polyurethane resin dispersion liquid and the mixing ratio of the aqueous polyurethane resin dispersion liquid and the filler were different. kind.

[3-1 Evaluation of heat resistance]

The heat resistance of the coating film formed using the samples of Examples 28 to 33 was evaluated in the same manner as in [2-1 Evaluation of heat resistance].

According to the results, it is understood that the coating film formed from the aqueous coating material of the present invention has high heat resistance. Therefore, it can be used in a higher temperature range. Further, according to Examples 28 to 33, it is understood that the heat resistance can be improved by the addition amount of the polyester-polyurethane.

[3-2 Evaluation of film adhesion]

The adhesion of the coating film formed using the samples of Examples 28 to 33 was evaluated in the same order as in the evaluation of [2-2 coating film adhesion] using an aluminum plate having a thickness of 0.4 mm. In addition, the case where the number of unexposed cells is 90 or more is taken as ○, the case where 70 or more is not peeled is Δ, and the case where less than 70 is used is Δ.

According to the results, it is understood that the coating film formed of the aqueous coating material of the present invention is excellent in adhesion. Further, when 25% or more of a polycarbonate-polyurethane having a low glass transition point and good adhesion is added to the coating material, the adhesion between the substrate and the coating film is further improved, which is preferable. By mixing the polyurethane fine particles, the properties of each of the polyurethane coating films can be exhibited.

[3-3 Evaluation of bending resistance]

The bending resistance of the coating film formed using the samples of Examples 28 to 33 was evaluated in the same procedure as [Evaluation of the bending resistance of 2-3].

According to the results, it is understood that the coating film formed of the aqueous coating material of the present invention has extremely excellent bending resistance in any of Examples 28 to 33. Therefore, it can be subjected to stamping or bending processing after being applied to a substrate.

[3-4 Evaluation of Scoring Hardness]

The score hardness of the coating film formed by using the samples of Examples 28 to 33 was evaluated in the same procedure as [Evaluation of [2-4 Scoring Hardness].

According to the results, it is understood that the coating film formed of the aqueous coating material of the present invention has excellent scoring hardness even if it has excellent bending resistance. Therefore, it is difficult to scratch. Moreover, by adding more than 50% of polycarbonate-polyurethane, the score is hard The degree is further improved, and it becomes difficult to scratch and is preferable. Further, since the scratch film formed by the water-based paint of the present invention is also temporarily scratched and the flaw is not conspicuous, it is also excellent as an external paint.

[4. Evaluation of coating properties]

By adding various additives such as a dispersant and an antifoaming agent to various coatings containing a polyurethane resin dispersion liquid and a filler, the operation and storage stability of the coating can be improved.

The evaluation of the physical properties of various coating materials containing a polyurethane dispersion liquid, a filler, and an additive is shown. The component materials of the sample used in the composition [4. Evaluation of coating physical properties] are as follows.

<dispersant>

. High molecular weight acidic polymer hydroxyalkyl ammonium salt solution: BYK-Chemie Japan Co., Ltd. (trade name) ANTI-TERRA-250

. Pigment affinity high molecular weight block copolymer: Japan BYK Chemical Co., Ltd. (trade name) DISPERBYK-190

. Pigment affinity copolymer: Japan BYK Chemical Co., Ltd. (trade name) DISPERBYK-191

. Pigment affinity copolymer: Japan BYK Chemical Co., Ltd. (trade name) DISPERBYK-194N

. Pigment affinity copolymer: Japan BYK Chemical Co., Ltd. (trade name) DISPERBYK-199

. Pigment affinity acrylic copolymer: Japan BYK Chemical Co., Ltd. Product Name) DISPERBYK-2012

(ANTI-TERRA, DISPERBYK are registered trademarks)

<antifoaming agent>

. Foaming Polymer / Hydrophobic Particle Mixture: Japan BYK Chemical Co., Ltd. (trade name) BYK-1710

<<Example 34>>

Weighing 15 parts by weight of PECU1, 15 parts by weight of synthetic cordierite (SS-1000) having an average particle diameter of 1.7 μm, and 1.72 parts by weight of ANTI-TERRA-250, and placing them in a polypropylene container, by spinning and revolving The mixture was mixed to prepare a sample of Example 34.

<<Example 35 to Example 40>>

The samples of Examples 35 to 40 were prepared in the same manner as in Example 34 except that the types and amounts of the additives were different.

[4-1 Effect of Dispersant]

Regarding the effect of the dispersant for preventing sedimentation of the filler, the evaluation results are as follows. The dispersion effect was confirmed by placing 30 g of the samples of Examples 34 to 39 and Example 4 in a 50 ml glass sample vial for 5 days, and then shaking the glass sample bottle by hand up and down to oscillate. After the start of the oscillation, the filler is redispersed in less than 3 minutes, and the filler is Δ in 3 minutes or more and less than 10 minutes, and x is not redispersed.

ANTI-TERRA-250 is a rheology control agent. Although the sedimentation rate of the filler can be reduced, the filler cannot be redispersed by shaking. It is believed that ANTI-TERRA-250 can be used to decelerate the settling velocity of the filler by using it in combination with other dispersants. Although DISPERBYK-191 and DISPERBYK-2012 can reduce the amount of settled filler, it takes a little time to utilize the dispersion of the oscillation. From this, it is understood that the filler can be dispersed to a relatively large particle diameter. Regarding DISPERBYK-199, the amount of the settled filler was substantially unchanged from that of the additive-free one, but the filler was easily dispersed by shaking. From this, it is understood that the fillers can be effectively prevented from agglomerating with each other.

On the other hand, regarding DISPERBYK-190, basically no effect was found. DISPERBYK-194N precipitates or agglomerates the fine particles of the polyurethane resin shortly after the addition. The reason is that the acid value of DISPERBYK-194N is larger than that of other dispersants, and the pH of the dispersion rises due to the addition. By selecting a dispersant suitable for the coating material of the present invention, the filler can be effectively dispersed, and heat dissipation performance can be effectively exhibited.

[4-2 Effect of defoamer]

The following describes a further improved form of the present invention. The water-based paint of Example 4 showed a sufficient heat-dissipating effect, but in order to impart a further adhesion effect to the aluminum plate, Example 40 (see Table 19) in which an antifoaming agent was added was produced. In Example 40, the defoaming effect was higher than that of Example 4, and the adhesion (film formation property of the coating film) was more excellent. That is, in the case where the filler is precipitated in the aqueous paint, it is effective to add an antifoaming agent in the case where it is necessary to oscillate and stir the paint to re-disperse the filler. The test was carried out as follows.

30 g of the sample of Example 40 and Example 4 was placed in a 50 ml glass sample vial, and the glass sample bottle was shaken up and down by hand and shaken for 3 minutes. After the completion of the shaking, the glass sample was allowed to stand for 10 minutes to confirm the bubble. There is no. Further, regarding the evaluation of the film formability, a coating material which was allowed to stand for 30 minutes after shaking with a film of 30 μm on an aluminum plate having a thickness of 0.4 mm was observed to have uneven appearance on the coating film.

It was confirmed that in the coating material to which BYK-1710 was added in Example 40, no large bubbles were generated after the shaking, and a small amount of small bubbles generated completely disappeared after 10 minutes. Further, unevenness or shrinkage due to bubbles is not generated at the time of film formation, and a uniform film can be formed.

[4-3 Evaluation of heat dissipation characteristics]

Using a coated aluminum plate (the coated aluminum plate was produced using the sample of Example 40 in [4-2 Effect of Defoamer]) as a heat dissipating member, using double-sided tape (Sumitomo 3M) The thermal conductive adhesive transfer tape manufactured by the company, No. 9885) was bonded to a transistor (Silicon NPN manufactured by Toshiba Crystal Co., Ltd., triple diffusion type, 2SD2012). A K thermocouple (ST-50 manufactured by Physicochemical Co., Ltd.) was attached to the back surface of the surface of the transistor to which the heat dissipating member was attached, and the temperature was recorded by a personal computer using a data logger. The heat dissipating member to which the transistor was mounted was placed in the center of a thermostatic chamber set at 40 ° C, and it was confirmed that the temperature of the transistor was 40 ° C and fixed, and then 1.18 V was applied to the transistor using a DC stabilized power source, and the transistor was measured. The temperature of the surface changes. The evaluation results are as follows.

According to the results shown in Table 21, the heat dissipating member using the aqueous coating material of Example 40 of the present invention has substantially the same degree of heat dissipation as that of Example 4. From this, it can be seen that the antifoaming agent does not adversely affect the heat dissipation characteristics. On the other hand, since bubbles are generated in the coating film, unevenness occurs in the coating film due to the bubbles, and thus there is a possibility that the heat dissipation characteristics are adversely affected. Therefore, such an risk can be avoided by adding an antifoaming agent.

All documents including publications, patent applications, and patents cited in the present specification are specifically indicated by the respective documents, and are incorporated herein by reference, and the entire contents thereof It is incorporated herein by reference.

The use of the nouns and the same reference signs used in connection with the description of the present invention (particularly in connection with the following claims) is not specifically indicated in the specification, or is not clearly contradicted by the context. , is interpreted as involving both singular and plural. As to the words "having", "having", "including" and "including", unless otherwise stated, they are interpreted as open-ended terms (that is, "including but not limited to ~"). As to the statement of the numerical range in the specification, if it is not specifically indicated in the present specification, it is only used as a notation for referring to each value corresponding to the range, each value is as Each of the descriptions in the specification is incorporated into the specification as it is. As far as all the methods described in the present specification are not specifically indicated in the present specification, or are not clearly contradicted by the context, all are performed in an appropriate order. The exemplifications of the present invention are not intended to limit the scope of the present invention. Any wording in the specification is not to be construed as an element which is not described in the scope of the patent application which is not limited by the practice of the invention.

In the present specification, a preferred embodiment of the present invention including the best mode known to the inventors of the present invention has been described in order to carry out the invention. Those skilled in the art, after reading the description, the preferred embodiments The deformation should become clear. The inventors expect skilled artisans to employ such modifications as appropriate, and it is contemplated that the present invention may be practiced otherwise than as specifically described herein. Therefore, the present invention includes all modifications and equivalents of the contents described in the appended claims. In addition, any combination of the elements in all variations is included in the present invention as long as it is not specifically indicated in the specification or is not clearly contradicted by the context.

10‧‧‧Heat components, membrane

11‧‧‧First filler

12‧‧‧Second filler

13‧‧‧Metal sheet

14‧‧‧Dissipating components with metal plates

Claims (14)

An aqueous coating comprising: a polyurethane resin microparticle; a first filler formed of an orthorhombic silicate mineral emitting far infrared rays; and water, dispersing the polyurethane resin microparticles and The first filler. The water-based paint according to claim 1, wherein the material constituting the fine particles of the polyurethane resin is selected from the group consisting of polycarbonate urethane, polyester urethane, At least one of a group consisting of an aliphatic polyurethane, a fatty acid modified polyurethane, an aromatic polyurethane, and a polyether polyurethane. The aqueous coating material according to claim 2, wherein at least one of the materials constituting the fine particles of the polyurethane resin is a polycarbonate polyurethane or a polyester polyurethane ester. The aqueous coating material according to any one of claims 1 to 3, wherein the polyurethane resin fine particles have an average particle diameter of 10 nm to 500 nm. The aqueous coating material according to any one of the items 1 to 3, wherein the polyurethane resin fine particles are a dispersion of the polyurethane resin fine particles and water. The dried solid has a glass transition point of -80 ° C to -20 ° C. The aqueous coating according to any one of claims 1 to 3, wherein the orthorhombic silicate mineral is cordierite and/or mullite. The water-based paint according to any one of claims 1 to 3, further comprising: a second filler selected from the group consisting of boron nitride, aluminum nitride, tantalum carbide, cerium oxide, aluminum oxide, oxidation At least one of a group consisting of zinc, titanium oxide, titanium black, and black lead is formed. The water-based paint according to claim 7, wherein the first filler and the second filler are contained in an amount of from 5 parts by weight to 150 parts by weight based on 100 parts by weight of the fine particles of the polyurethane resin. The second filler is 1 part by weight to 150 parts by weight with respect to 100 parts by weight of the first filler, and the first filler and the second filler are powders, and the average particle diameter is 0.01 μm to 30 μm. The aqueous coating material according to any one of claims 1 to 3, wherein the solid content after drying has a 5% mass loss temperature of 270 ° C or higher. The aqueous coating material according to any one of claims 1 to 3, which comprises an antifoaming agent having a foam breaking property or a foam suppressing property. A heat dissipating member which is coated as in the first to tenth claims of the patent application The aqueous coating material according to any one of the items is dried. A metal component comprising: a metal component body; a film formed by applying an aqueous coating material according to any one of claims 1 to 10 to the metal component body, followed by drying. The metal component according to claim 12, wherein the metal component body is formed by at least one selected from the group consisting of copper, iron, magnesium, aluminum, and alloys thereof. An electronic device comprising: the metal component according to claim 12 or 13; the electronic component having a heat generating portion; and the metal component body of the metal component is disposed in contact with the heat generating portion On the electronic component.